Preview jpeg rotation strangeness

Hi,
when I open a jpeg picture that I've downloaded (or dragged to the Desktop from Safari or Firefox) with Preview, rotate the picture in Preview and then save and reopen it (again with Preview), the picture is not rotated.
Preview seems to work on the picture, because the the modification date is changed after saving it, but it is not rotated.
I've read about the EXIF-compatible way Preview rotates pictures, but this should only cause problems with other applications, not Preview itself.
Furthermore not all jpegs are affected, but most I've tried, since I've discovered the problem.
Jpegs I've created with PS work rotate just fine in Preview.
Maybe someone can shed some light on this.
Preview version is 3.0.9 (409).
Regards
Oliver
MacBook Mac OS X (10.4.9) C2D, 2Ghz, 2GB RAM, 120GB HD

I've seen the same thing and have been searching Discussions, only to find that this appears to be a bug introduced with 10.4.9

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